Wordpress: cutom query by custom metadata (meta field) of taxonomy term - wordpress

Question

I have a custom post type "member" with custom taxonomy "member_category". In this taxonomy I have a custom field (as metadata) called "display".
Now I want to query members from the DB and only recieve members who have the taxonomy with the metadata "display" with value of "1".
My attempt is:
$args = array(
'post_type' => 'member',
'tax_query' => array(
array(
'taxonomy' => 'member_category',
'value' => '1',
'field' => 'term_meta[display]' (????)
'operator' => 'LIKE'
)
));
$query = new WP_Query($args);
But it's not working.
Any idea? Maybe I should use a SQL query? If so, Which $wpdb query should I write?
Thanks

Answer 1

You should first fetch the terms having your desired meta value like this:
$term_args = array('taxonomy' => 'member_category');
$terms = get_terms( $term_args );
$term_ids = array();
if ( ! empty( $terms ) && ! is_wp_error( $terms ) )
{
foreach( $terms as $term )
{
$val = get_term_meta( $term->term_id, 'display', true);
if( $val == '1' ) {
// push the ID into the array
$term_ids[] = $term->ID;
}
}
}
Then passing combined id's on the tax_query as below :
$args = array('post_type' => 'member');
$tax_query = array();
if(sizeof($term_ids))
{
$tax_query = array(
'relation' => 'AND',
array(
'taxonomy' => 'member_category',
'field' => 'ID',
'terms' => $term_ids,
'operator' => 'IN',
)
);
}
if(sizeof($tax_query))
$args['tax_query'] = $tax_query;

Answer 2

You don't need to use SQL queries. If you are querying metadata, you need to use the meta query.
$args = array(
'post_type' => 'member',
'meta_query' => array(
array(
'key' => 'display',
'value' => '1',
)
));
On your args you have everything under tax query which is why it does not work.